I am tired of fighting the frozen water in the coop every mornin' and so I am running electric power out there for not only to keep warm water but also for lighting. I have found two different types of water warmers available- the heated base type for double walled metal founts and a plastic waterer with a built in heater. Anyone have experiences with either type? Which would you consider the best of the two? Just discovered on another post on this thread a home-made type made from a metal oil changing pan and may just make a couple of those!